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Nonlinear Effect on Focusing Gain of a Focusing Transducer with a Wide Aperture Angle |
| LIU Ming-He;ZHANG Dong;GONG Xiu-Fen |
| Lab of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093 |
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| Cite this article: |
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LIU Ming-He, ZHANG Dong, GONG Xiu-Fen 2007 Chin. Phys. Lett. 24 2267-2271 |
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Abstract Nonlinear effect on focusing gain of acoustic field radiated from a 1-MHz focusing transmitter with a wide aperture angle of 35° is theoretically and experimentally investigated. With the enhancement of nonlinearity, the focusing gains of both intensity and peak positive pressure show non-monotonic behaviour. There exist the same saturated levels at which the maximum outputs are reached and their spatial distributions are more localized. In contrast, the peak negative pressure always decreases monotonically and its spatial distribution is less localized.
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| Keywords:
43.80.+p
43.25.+y
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Received: 17 January 2007
Published: 25 July 2007
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